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MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...

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Updated: May 2, 2026

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

Published on: November 28, 2017

High-performance photodetector based on MoS₂/vertical graphene.

Yifei Ma¹, Ke Fan¹, Sai Huang¹

¹State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Laser Spectroscopy, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, People's Republic of China.

|August 21, 2025

Summary

This summary is machine-generated.

This study introduces a novel MoS2/vertical graphene (VG) photodetector, achieving ultra-high light absorption and enhanced photocurrent. This MoS2/VG composite offers a promising solution for high-performance broadband optoelectronic devices.

Keywords:

MoS2 PECVD photodetector vertical graphene

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Last Updated: May 2, 2026

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

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Published on: November 28, 2017

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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Published on: February 1, 2022

Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Graphene's zero-bandgap structure enables broad spectral response for photodetectors.
Graphene's atomic thickness limits light absorption to ~2%, hindering performance.
MoS2/graphene heterojunctions improve absorption but involve complex transfers and limited efficiency.

Purpose of the Study:

To fabricate a high-performance photodetector using a MoS2/vertical graphene (VG) composite.
To enhance light absorption and photocurrent response by leveraging VG's properties.
To eliminate complex transfer processes through direct growth of MoS2 on VG.

Main Methods:

Fabrication of vertical graphene (VG) via plasma-enhanced chemical vapor deposition (CVD).
Direct growth of few-layer MoS2 onto VG using CVD.
Characterization of the MoS2/VG composite photodetector's optical and electrical properties.

Main Results:

VG achieved an ultra-high absorption rate of 97% across the 400-2000 nm range.
The MoS2/VG photodetector exhibited significantly enhanced photocurrent responses.
Achieved responsivity of 10.4 mA W⁻¹ and rise/decay times below 300 ms.

Conclusions:

The MoS2/VG composite demonstrates synergistic enhancement for superior photodetector performance.
Direct growth eliminates transfer complexity, paving the way for simpler fabrication.
The developed photodetector shows significant potential for future broadband optoelectronic applications.